Here's where you need to go to review specific chapters.
(This is just a starter. Email me here if you need more or find something fabulous on your own that needs to be added!)

Chapter One:
Practice using the Order of Operations:
http://amby.com/educate/ord-op/


Chapter Two:
Distributive Property:
http://www.virtualnerd.com/pre-algebra/one-two-step-equations/distributive-property-examples.ph
Simplifying practice:
http://www.mathscore.com/math/practice/Simplifying%20Algebraic%20Expressions/


Chapter Three:
Absolute Value:
http://www.purplemath.com/modules/solveabs.htm
Working with Integers:
http://www.mathgoodies.com/lessons/vol5/intro_integers.html
Using a Coordinate Plane (graphing):
http://www.mathopenref.com/coordplane.html


Chapter Four:
Solving Two Step Equations:
http://www.learningwave.com/lwonline/algebra_section1/twostep.html
Variables on Both Sides of an Equation:
http://www.yourteacher.com/prealgebra/solvingequationswithvariablesoneachside.php


Chapter Five:
Types of Graphs:
http://math.youngzones.org/stat_graph.html
Misleading graphs:
http://www.math6.org/graphing/6.8_quiz.htm
Line Plots:
http://ellerbruch.nmu.edu/classes/cs255w03/cs255students/nsovey/p5/p5.html
Scatter Plots:
http://www.youtube.com/watch?v=i1uKiZpkl9A
http://staff.argyll.epsb.ca/jreed/math9/strand4/scatterPlot.htm


Chapter Six:
Divisibility Tests:
http://www.mathsisfun.com/divisibility-rules.html
Factors and Primes:
http://www.cimt.plymouth.ac.uk/projects/mepres/book8/bk8i2/bk8_2i1.htm
Greatest Common Factors:
http://www.math.com/school/subject1/lessons/S1U3L2GL.html
Least Common Multiples:
http://www.math.com/school/subject1/lessons/S1U3L3GL.html
Simplifying Fractions:
http://www.mathplayground.com/fractions_reduce.html
Rational Numbers and Decimals:
http://www.eduplace.com/math/mathsteps/7/a/index.html
Powers and Exponents:
http://www.purplemath.com/modules/exponent.htm
Scientific Notation:
http://www.purplemath.com/modules/exponent3.htm


Chapter Seven:
Fractions:
http://www.yourteacher.com/prealgebra/comparingfractions.php
Percents, Decimals, Fractions:
http://www.mccc.edu/~kelld/CompFDP.htm
http://www.mathplayground.com/Decention/Decention.html
Finding a Percent of a number:
http://www.learningwave.com/lwonline/percent/percent_num.html


Chapter Eight:
rates and ratios:
http://www.algebralab.org/studyaids/studyaid.aspx?file=Algebra1_2-8.xml
solving proportions:
http://www.algebrahelp.com/lessons/proportionbasics/
percent increase and decrease:
http://www.onemathematicalcat.org/algebra_book/online_problems/calc_percent_inc_dec.htm
probability:
http://www.mathgoodies.com/lessons/vol6/intro_probability.html


Chapter Nine:
Solving Multi-Step Inequalities:
http://www.mathsisfun.com/algebra/inequality-solving.html
Pythagorean Theorem:
http://www.mathsisfun.com/pythagoras.html
Square Roots:
http://www.math.com/school/subject1/lessons/S1U1L9GL.html
Graphing inequalities:
http://www.mathnstuff.com/math/algebra/ainequ.htm
The Triangle Inequality:
http://www.mathopenref.com/triangleinequality.html


Chapter Ten:
parallel lines:
http://www.mathsisfun.com/geometry/parallel-lines.html
Symmetry:
http://www.haelmedia.com/OnlineActivities_txh/mc_txh4_001.html
Quadrilaterals:
http://www.mathsteacher.com.au/year7/ch09_polygons/04_quad/quad.htm
polygons and congruence:
http://www.mathopenref.com/congruent.html
angle and side relationships:
http://www.mathopenref.com/trianglesideangle.html


Chapter Eleven:
area and perimeter:
http://www.bgfl.org/custom/resources_ftp/client_ftp/ks2/maths/perimeter_and_area/index.html
reflections:
http://www.yourteacher.com/prealgebra/mathreflections.php
rotations:
http://www.mathwarehouse.com/transformations/rotations-in-math.php
translations:
http://www.mathwarehouse.com/transformations/translations-in-math.php
General practice at reflections, rotations, and translations:
http://www.superteacherworksheets.com/translation-rotation-reflection.html
similarity:
http://www.math.com/school/subject1/lessons/S1U2L4GL.html
trigonometry: (PLEASE NOTE...THIS COVERS MORE MATERIAL THAN WE DID/THAN YOU ARE EXPECTED TO KNOW YET)
http://www.onlinemathlearning.com/basic-trigonometry.html


Chapter Twelve:
Area and Circumference of Circles:
http://www.homeschoolmath.net/worksheets/circle.php
Surface area of prisms and cylinders:
http://hotmath.com/help/gt/genericprealg/section_9_4.html
volumes of prisms:
http://www.mathsisfun.com/geometry/prisms.html
volumes of cylinders:
http://www.aaamath.com/g79_vox4.htm#section1
volumes of pyramids and cones:
http://www.shmoop.com/basic-geometry/volume-pyramids-cones.html
volumes of spheres:
http://library.thinkquest.org/12006/S-M-2.shtml
similar solids:
http://www.sophia.org/similar-solids--2-concept


Chapter Thirteen:
linear equations (graphing):
http://www.math.com/school/subject2/lessons/S2U4L3GL.html
finding midpoints:
http://www.virtualnerd.com/algebra-1/radical-expressions-equations/midpoint-between-coordinates.php
finding slope tutorial:
http://www.wtamu.edu/academic/anns/mps/math/mathlab/int_algebra/int_alg_tut15_slope.htm
graphing linear inequalities:
http://www.algebra-class.com/graphing-inequalities.html
Slope-intercept form:
http://www.purplemath.com/modules/strtlneq.htm